Mercedes-Benz has had great success with its front-wheel drive compact platform that underpins the CLA-Class, GLA-Class and other models. Now, it looks like that spirit of sharing might be moving up market for the Three-Pointed Star. AutoBild in Germany suggests the company is working on a modular chassis for the next SL-Class and SLK-Class, and it would be just one of many rumored changes for the droptop models.